UWorld Biostatistics Subject Review
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Crude mortality rate - CORRECT ANSWERS✅✅Number of deaths divided by total
population size
Cause-specific mortality rate - CORRECT ANSWERS✅✅Number of deaths from a
particular disease divided by total population size
Case-fatality rate - CORRECT ANSWERS✅✅Number of deaths from specific disease
divided by number of people with disease
Standardized mortality ratio (SMR) - CORRECT ANSWERS✅✅Observed number of death
divided by expected number of death
(sometimes used in occupational epidemiology)
Attack rate - CORRECT ANSWERS✅✅Number of patients with disease divided by total
population at risk
(Incidence measure typically used in Infectious Disease epidemiology)
Maternal mortality rate - CORRECT ANSWERS✅✅Number of maternal death divided by
number of live births
Crude birth rate - CORRECT ANSWERS✅✅number of live births divided by total
population size
Coefficient of determination - CORRECT ANSWERS✅✅Correlation coefficient squared
(R^2)
, percentage of variability in the outcome factor that is explained by the predictor factor.
What is Attributable Risk? - CORRECT ANSWERS✅✅Excess incidence of a disease due
to a particular factor (exposure)
Attributable risk of 0.25
What does that mean? - CORRECT ANSWERS✅✅25 out of 100 cases of a disease are
attributable to a particular factor (exposure)
Attributable risk is also called risk difference
Attributable risk percent: formula - CORRECT ANSWERS✅✅Attributable risk divided by
the incidence of the disease in the exposed population
or
(RR - 1) / RR
What is attributable risk percent? - CORRECT ANSWERS✅✅the percent of a disease in
exposed population that is attributable to a particular risk factor (exposure);
Contribution of a given exposure to the incidence of a disease in *relative* term
Population attributable risk percent - CORRECT ANSWERS✅✅percent of the disease in
the studying population that is attributable to smoking
Population attributable risk percent - formula - CORRECT ANSWERS✅✅1) find incidence
of disease in study population as a whole
2) substract incidence of disease among people with no exposure from 1)
3) divided 2) by 1)
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Crude mortality rate - CORRECT ANSWERS✅✅Number of deaths divided by total
population size
Cause-specific mortality rate - CORRECT ANSWERS✅✅Number of deaths from a
particular disease divided by total population size
Case-fatality rate - CORRECT ANSWERS✅✅Number of deaths from specific disease
divided by number of people with disease
Standardized mortality ratio (SMR) - CORRECT ANSWERS✅✅Observed number of death
divided by expected number of death
(sometimes used in occupational epidemiology)
Attack rate - CORRECT ANSWERS✅✅Number of patients with disease divided by total
population at risk
(Incidence measure typically used in Infectious Disease epidemiology)
Maternal mortality rate - CORRECT ANSWERS✅✅Number of maternal death divided by
number of live births
Crude birth rate - CORRECT ANSWERS✅✅number of live births divided by total
population size
Coefficient of determination - CORRECT ANSWERS✅✅Correlation coefficient squared
(R^2)
, percentage of variability in the outcome factor that is explained by the predictor factor.
What is Attributable Risk? - CORRECT ANSWERS✅✅Excess incidence of a disease due
to a particular factor (exposure)
Attributable risk of 0.25
What does that mean? - CORRECT ANSWERS✅✅25 out of 100 cases of a disease are
attributable to a particular factor (exposure)
Attributable risk is also called risk difference
Attributable risk percent: formula - CORRECT ANSWERS✅✅Attributable risk divided by
the incidence of the disease in the exposed population
or
(RR - 1) / RR
What is attributable risk percent? - CORRECT ANSWERS✅✅the percent of a disease in
exposed population that is attributable to a particular risk factor (exposure);
Contribution of a given exposure to the incidence of a disease in *relative* term
Population attributable risk percent - CORRECT ANSWERS✅✅percent of the disease in
the studying population that is attributable to smoking
Population attributable risk percent - formula - CORRECT ANSWERS✅✅1) find incidence
of disease in study population as a whole
2) substract incidence of disease among people with no exposure from 1)
3) divided 2) by 1)
